How to use relation operator in C Language

#include <stdio.h>
int main()
{
    int a, b;
    printf("enter value for a and b : ");
    scanf("%d%d", &a, &b);

    if (a < b)
    {
        printf("%d is less than %d\n", a, b);
    }
    if (a <= b)
    {
        printf("%d is less than or equal to %d\n", a, b);
    }
    if (a == b)
    {
        printf("%d is equal to %d\n", a, b);
    }
    if (a != b)
    {
        printf("%d is not equal to %d\n", a, b);
    }
    if (a > b)
    {
        printf("%d is greater than %d\n", a, b);
    }
    if (a >= b)
    {
        printf("%d is greater than or equal to %d\n", a, b);
    }
    return 0;
}